Swift：错误：'required'初始化程序'init（编码器:)'必须由'UIView'的子类提供 [英] Swift : Error: 'required' initializer 'init(coder:)' must be provided by subclass of 'UIView'

问题描述

我在swift 2中构建应用程序时遇到问题.Xcode说：

I have a problem when I build my app in swift 2. Xcode says:

'required'initializer'init（编码器： ）'必须由'UIView'的子类提供

'required' initializer 'init(coder:)' must be provided by subclass of 'UIView'

这是该类的代码：

class creerQuestionnaire: UIView {
  @IBOutlet weak var nomQuestionnaire: UITextField!
  @IBOutlet weak var question: UITextField!
  @IBOutlet weak var reponse: UITextField!
  var QR: Questionnaire

  @IBAction func creerQuestion(sender: AnyObject) {
    QR.ajouterQuestion(question.text!, nouvReponse: reponse.text!)
  }
}

这是课程调查问卷：

import Foundation

class Questionnaire {
  var QR = [String(), String()]

  func getQuestion(nbQuestion: Int) ->String {
    return QR[nbQuestion]
  }

  func getReponse(nbReponse: Int) ->String {
    return QR[nbReponse]
  }

  func ajouterQuestion(nouvQuestion: String, nouvReponse: String) {
    QR += [nouvQuestion, nouvReponse]
  }
}

Merci！

推荐答案

注意必需：在定义类初始化程序之前写入必需的修饰符，以指示该类的每个子类都必须实现该初始化程序。

Note for required: Write the required modifier before the definition of a class initializer to indicate that every subclass of the class must implement that initializer.

注意覆盖：当覆盖超类指定的初始化程序时，总是编写覆盖修饰符，即使你的子类的初始化程序的实现是一个方便的初始化程序。

Note for override: You always write the override modifier when overriding a superclass designated initializer, even if your subclass’s implementation of the initializer is a convenience initializer.

以上两个注释均来自： Swift编程语言/初始化

Above both notes are referred from: Swift Programming Language/Initialization

因此，您的UIView子类应类似于以下示例：

Therefore, your subclass of UIView should look similar to the sample below:

class MyView: UIView {
    ...
    override init(frame: CGRect) {
        super.init(frame: frame)
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
    ...
}

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